Question about 2002 Volkswagen Beetle Turbo S

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The blue temp icon comes on as usual on start up thn as engine warms it goes off as you would expect but on long journeys it comes back on thn goes on and off. What could be the problem.

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Faulty thermostat is most common problem. Blue lamp on indicates coolant not reached operating temperature.

Blue Lamp hould stay out when coolant reaches operating temperature. VW have updated the Coolant Temperature Sensor. Thermostat is opening too long allowing coolant to cool below operating temperature tripping Blue Lamp..

New sensor should be GREEN in color and lives on the coolant hose running back across the rear of the engine.

When getting one replaced make sure you get the 'O' ring and new plastic clip to hold it in, along with the Sensor. They are orderable separately and your VW parts guy will not offer 'O' ring and clip unless you ask.

Check coolant is circulating into the bottle on the inner fender .
These engines also suffer from failure of the coolant pump when the plastic impeller breaks up or comes off the drive shaft. this causes overheating.

Posted on Jan 13, 2011

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First off need to know if it is a 2.0 or 1.8T engine. Most likely you have a 2.0L engine. The coolant light on the dash will stay blue untill the temp reaches a set temp by ECM, then goes out. Since the Beetles do not have a temp gauge you dont know what the actual temperature is. I replace thermostats on these all the time for this problem on these cars. To test this, start car and let run at idle and set heater fan on low. Let run untill you feel warm to hot air coming out the vents. Once its as warm as it is going to get, go drive the car at a steady cruise and see if the temp drops. If so then you need a thermostat replacement. I only use OE VW thermostats 050121113C. Hope that helps you out. Kevin

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